How many times can you annodize parts?

Hey guys, I know this may be a dumb question but I couldn't really find an answer. I have a PM8 that I recently purchased which I love how it feels and shoots, but it is pretty beat up cosmetically. The gun had already been re ano'd pink by the previous owner, so is it possible to re ano? The one thing I'm concerned about is whether some tolerances for some ID/ODs will be out too far to properly seal due to multiple anodizng processes.

I do not feel comfortable doing a gun more than 3 times even though it my support 5 or 6 times no problem.

It also depends on the anodizing layer. For example if the guy before me is using a system with a poor combination of things like low current density and high acid concentration the layer will be further embedded into the aluminum hence more substrate is removed.

In reality there should be no issue with redoing your gun, but you will be hard pressed to find an anodizer that will make you a guarantee that there will be no troubles.